The burn in is the big deal. My Audio Magic Stealth required some very serious burn-in time. We're talking 400 hours minimum. That's with a space heater hooked up to this baby, running 20 hours a day. You need some high current/amperage to break the Stealth in properly. It was definitely worth it. I'm just not sure I want to go through that whole deal again. Audio Magic charges only $100 for the upgrade. Of course, they tell me it offers quite a change, and I believe them, but I would love to hear from someone who actually, hands on, had it done. I'll check out that website you posted. Thanks again, warren